/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: BooleanExpr.java,v 1.2.4.1 2005/09/01 11:44:57 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.GOTO;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.PUSH;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

/**
 * This class implements inlined calls to the XSLT standard functions
 * true() and false().
 *
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
final class BooleanExpr extends Expression {

  private boolean _value;

  public BooleanExpr(boolean value) {
    _value = value;
  }

  public Type typeCheck(SymbolTable stable) throws TypeCheckError {
    _type = Type.Boolean;
    return _type;
  }

  public String toString() {
    return _value ? "true()" : "false()";
  }

  public boolean getValue() {
    return _value;
  }

  public boolean contextDependent() {
    return false;
  }

  public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    ConstantPoolGen cpg = classGen.getConstantPool();
    InstructionList il = methodGen.getInstructionList();
    il.append(new PUSH(cpg, _value));
  }

  public void translateDesynthesized(ClassGenerator classGen,
      MethodGenerator methodGen) {
    final InstructionList il = methodGen.getInstructionList();
    if (_value) {
      il.append(NOP);     // true list falls through
    } else {
      _falseList.add(il.append(new GOTO(null)));
    }
  }
}
